CN102231652A - C form-factor pluggable (CFP) optical transceiver with interleaver - Google Patents
C form-factor pluggable (CFP) optical transceiver with interleaver Download PDFInfo
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Abstract
The invention discloses a C form-factor pluggable (CFP) optical transceiver with an interleaver. The CFP optical transceiver comprises a transmitter and a receiver. The transmitter has two groups of 2:1 modified multiplexers and the interleaver connected with the 2:1 modified multiplexers by an optical fiber, wherein the 2:1 modified multiplexers and the interleaver are all used for coupling two paths of optical signals with different wavelengths into the same optical fiber for transmission. The CFP optical transceiver with the interleaver is used for 40G or 100G LR4 and ER4 type CFP communication systems, has the advantages of simple structure and low cost, and is easy to package and produce in batches. In the structure, coarse wavelength division multiplexing (CWDM)/local area network-wavelength division multiplexing (LAN-WDM) optical signals with four wavelengths are multiplexed into two groups of optical signals by the 2:1 modified multiplexers (2:1MUX), and then the two groups of optical signals enter the same optical fiber by the interleaver. By the technology provided by the invention, the cost of the receiver can be reduced to 1/5 to 1/10 of that of the prior art.
Description
Technical field
The relevant a kind of optical transceiver of the present invention is meant a kind of CFP optical transceiver that has light intersection wavelength division multiplexer at the light transmitting terminal especially.
Background technology
In recent years, because the increase rapidly (for example cloud computing, the connection of router-to-router, the transmission of image) of the market demand, Fiber Optical Communication System is being upgraded to the speed of 40G, and 40G optical transceiver (Transponder) is a subsystem the most key in the 40G optical communication system.
The 40G optical transceiver need be used more more advanced than 10G optical transceiver, complexity and difficult technologies, and its cost is higher.Compare with the optical transceiver of serial 40G, 40G CFP (the pluggable optical transceiver device of CFP:C Form-Factor Pluggable-C type external form is as 40G BASE LR4CFP) has the advantage of lower cost and long transmission distance.Because the quick increase of communication service demand, the 40G system has accounted for significant proportion in utility system, and also there is small-scale development in the 100G system.CFP is the common package dimension product that satisfies multi-source agreement, be used for the transmitting high speed digital signal, the CFP optical transceiver is applied in utility system, the CFP2 of littler package dimension and CFP4 optical transceiver are also developed, but the multi-source agreement that satisfies CFP2 and CFP4 is not also thoroughly finished.40GCFP/CFP2/CFP4 and 100G CFP/CFP2/CFP4 are the very important optical transceivers of client, in the CFP optical transceiver, it is highly important that transmitter and (or) receiver needs little size.
Figure 1 shows that the structure of traditional 40GBASE-LR4CFP optical transceiver.At transmitting terminal, four road CWDM (Coarse Wavelength Division Multiplexer, coarse wavelength division multiplexer) wavelength (is respectively 1271nm, 1291nm, 1311nm, 10Gbit/s light signal TX3 1331nm), TX2, TX1, TX0 is respectively by CDR (Clock Data Recover, clock and data recovery), LD (Laser Diode, laser diode), DML (Directly Modulated Laser, direct modulated laser) and the CWDM MUX (use in sparse wave-division multiplexer) of a 4:1 finish multiplexing, be multiplexed in the emission monomode fiber (SMF TX, Single Mode Fiber TX); At receiving terminal, optical signals receive CWDM DeMUX (the use in sparse wave-division demultiplexing device) demultiplexing of monomode fiber (SMFRX, Single Mode Fiber) by a 1:4 be 4 CWDM wavelength (1271nm, 1291nm, 1311nm, 1331nm).Be four-way serial bus interface (XLAUI) at the light inputting end of transmitting terminal and the bright dipping end of receiving terminal, between the CDR of transmitting terminal and the LD and be physical medium associated layers interface (PMD service interface) between the CDR of receiving terminal and the TIA (transimpedance amplifier).Because the size of CFP/CFP2/CFP4 is smaller, therefore make the size of transmitting terminal 4*DML+CWDM MUX and receiving terminal CWDM DEMUX+4* (PIN/TIA) (PIN is the p-i-n photodiode) structure as far as possible little just extremely important.In order to reduce the size of transmitter, common way is to use integrated 4* (DML)+CWDM MUX, perhaps uses the DML of CWDM MUX+4 of magnetic tape trailer fibre magnetic tape trailer fibre that separates of one.For 4* (DML)+CWDM MUX, there is dual mode to realize, the one, with integrated AWG (Array Waveguide Grating, array waveguide grating) 4* (DML)+MUX, another kind is the free space optical system that usefulness and DML are integrated together.For integrated 4* (DML)+CWDM MUX, encapsulation difficulty is bigger, and supplier is few, the packaging cost height of integrated in addition 4* (DML)+CWDM MUX, and rate of finished products is low, is difficult to large-scale production.Also be faced with same problem for small-sized CWDM MUX, the high and very difficult large-scale production of cost.
Figure 5 shows that the traditional structure of 100GBASE-LR4CFP.At transmitting terminal, the light signal of ten road 10Gbit/s of transmission channel (TXLANE) becomes four the tunnel by a 10:4 parallel-to-serial converter (10:4Serializer) and respectively is the LAN-WDM of 25Gbit/s (Local Area Network-Wavelength Division Multiplexer, local area network (LAN)-wavelength division multiplexing) wavelength (1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm) light signal, and then successively by MD (modulators drives), an EML (Electro-Absorption Modulated Laser, Electroabsorption Modulated Laser) and a 4:1LAN-WDM MUX (local area network (LAN)-wavelength division multiplexer) carry out multiplexed; At receiving terminal, light signal is by behind a 1:4LAN-WDM DeMUX (local area network (LAN)-wavelength division multiplex demodulation multiplexer) demultiplexing, become 4 LAN-WDM wavelength (1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm), receive by receive path (RXLANE) via 4:10 deserializer (4:10Deserializer), keep therefore that the size of LAN-WDM MUX is enough little just to seem particularly important.But the transmitting terminal of present 100GBASE-LR4CFP and the packaging cost height of receiving terminal, rate of finished products is low, and the cost height, is difficult to large-scale production.
Summary of the invention
In view of this, main order of the present invention is to provide a kind of easy encapsulation, cost is low and the CFP optical transceiver with light intersection wavelength division multiplexer of suitable batch process.
For achieving the above object, the invention provides a kind of CFP optical transceiver with light intersection wavelength division multiplexer, it includes transmitting terminal and receiving terminal, described transmitting terminal has two groups of 2:1 diplex multiplexers and intersects wavelength division multiplexer with a light that this 2:1 diplex multiplexer is connected by optical fiber, and described 2:1 diplex multiplexer and described light intersect wavelength division multiplexer and is used for that all the two-way wavelength optical signals is coupled into an optical fiber and transmits.
Described light intersection wavelength division multiplexer is sparse light intersection wavelength division multiplexer, in described transmitting terminal, four road light signals are multiplexed in the emission monomode fiber by clock and data recovery, laser diode, described 2:1 diplex multiplexer and described sparse light intersection wavelength division multiplexer successively and transmit.
Preferably, it is sparse light when intersecting wavelength division multiplexer that light intersects wavelength division multiplexer, the structure that described receiving terminal adopts the p-i-n photodiode to combine with transimpedance amplifier.
Preferably, it is sparse light when intersecting wavelength division multiplexer that light intersects wavelength division multiplexer, the structure that described receiving terminal adopts semiconductor optical amplifier to combine with p-i-n photodiode and transimpedance amplifier.
Intersecting wavelength division multiplexer when light is that sparse light is when intersecting wavelength division multiplexer, what described sparse light intersected the wavelength division multiplexer use is the dielectric filter plate, described 2:1 diplex multiplexer is made of dielectric filter plate and two coaxial packaging transmitters, and this coaxial packaging transmitter is direct modulated laser.
Preferably, described light intersection wavelength division multiplexer is a local area network (LAN) light intersection wavelength division multiplexer, in described transmitting terminal, ten road light signals become four road light signals by a 10:4 parallel-to-serial converter, the optical signals modulators drives successively enters described 2:1 diplex multiplexer and described local area network (LAN) light intersection wavelength division multiplexer then, and last optical multiplexed signal is used in the emission monomode fiber and transmitted.
When light intersection wavelength division multiplexer intersects wavelength division multiplexer for local area network (LAN) light, the structure that described receiving terminal adopts the p-i-n photodiode to combine with transimpedance amplifier.
When light intersection wavelength division multiplexer intersects wavelength division multiplexer for local area network (LAN) light, the structure that described receiving terminal adopts semiconductor optical amplifier to combine with p-i-n photodiode and transimpedance amplifier, perhaps described receiving terminal adopts avalanche diode.
When light intersection wavelength division multiplexer intersects wavelength division multiplexer for local area network (LAN) light, described 2:1 diplex multiplexer is made of dielectric filter plate and two coaxial packaging transmitters, and this coaxial packaging transmitter is direct modulated laser or Electroabsorption Modulated Laser.
Described receiving terminal adopts the structure that comprises light intersection Wave decomposing multiplexer and 1:2 diplex demultiplexing device, and this light intersection Wave decomposing multiplexer is sparse light intersection Wave decomposing multiplexer or local area network (LAN) light intersection Wave decomposing multiplexer.
The present invention has light, and to intersect the CFP optical transceiver of wavelength division multiplexer be that a kind of this optical transceiver is simple in structure at the optical transceiver that is used for 40G or 100G CFP (LR4 and ER4 type) communication system, has low cost, encapsulation and the advantage produced in batches easily easily.In this structure, the CWDM of 4 wavelength (or LAN-WDM) light signal is multiplexed with two groups of light signals by 2:1MUX, and two groups of light signals enter in the optical fiber by light intersection wavelength division multiplexer then.Adopt technology of the present invention, can make the receiving terminal cost be reduced to 1/5th to 1/10th of original technology.
Description of drawings
Fig. 1 is the structural representation of traditional 40GBASE-LR4CFP optical transceiver;
Fig. 2 has the structural representation of the CFP optical transceiver embodiment one of light intersection wavelength division multiplexer for the present invention;
Fig. 3 a is a 2:1 diplex multiplexer structural representation one in the embodiment of the invention one;
Fig. 3 b is a 2:1 diplex multiplexer structural representation two in the embodiment of the invention one;
Fig. 4 is that 2:1 diplex multiplexer and the CWDM light of transmitting terminal in the embodiment of the invention one intersects the composition structural representation of wavelength division multiplexer;
Fig. 5 is the structural representation of traditional 100GBASE-LR4CFP optical transceiver;
Fig. 6 has the structural representation of the CFP optical transceiver embodiment two of light intersection wavelength division multiplexer for the present invention;
Fig. 7 a is that 2:1 diplex multiplexer and the LAN-WDM light of transmitting terminal in the embodiment of the invention two intersects the composition structural representation one of wavelength division multiplexer;
Fig. 7 b is that 2:1 diplex multiplexer and the LAN-WDM light of transmitting terminal in the embodiment of the invention two intersects the composition structural representation two of wavelength division multiplexer.
Embodiment
For ease of structure of the present invention and the effect that reaches are had further understanding, the preferred embodiment that develops simultaneously of existing conjunction with figs. is described in detail as follows.
The CFP optical transceiver that the present invention has light intersection wavelength division multiplexer includes transmitting terminal and receiving terminal, this transmitting terminal has the 2:1 diplex multiplexers (Modified Diplexer 2:1MUX) of two groups of improvement and intersects wavelength division multiplexer (Interleaver) with a light that 2:1 diplex multiplexer is connected by optical fiber, and this 2:1 diplex multiplexer and light intersect wavelength division multiplexer and all the two-way wavelength optical signals can be coupled in the optical fiber and transmit.
As shown in Figure 2, the present invention has light and intersects the CFP optical transceiver of wavelength division multiplexer and be used for the CFP of 40G, as 40GBASE-LR4CFP, in this CFP optical transceiver, its transmitting terminal comprises that the sparse light of a CWDM 20nm/40nm intersects the 2:1 diplex multiplexer (hereinafter to be referred as 2:1MUX) of wavelength division multiplexer (being CWDM interleaver) and two improvement, and CWDM interleaver and 2 2:1MUX are positioned at the physical package of CFP.Transmitting terminal has four road CWDM wavelength X 1, λ 2, λ 3, λ 4 (λ 1=1271 ± 6.5nm, λ 2=1291 ± 6.5nm, λ 3=1311 ± 6.5nm, the 10Gbit/s of λ 4=1331 ± 6.5nm) (10Gbit/s only is a nominal value, actual speed rate can between 10-15Gbit/s) light signal is as Fig. 3 a and shown in Figure 4, wherein λ 1 and λ 3 light signals are multiplexed with one road light signal by one of them 2:1MUX, as Fig. 3 b and shown in Figure 4, λ 2 and λ 4 light signals are multiplexed with one road light signal by another 2:1MUX, and (λ 1 for this two ways of optical signals, λ 3 and λ 2, λ 4) transmit in an optical fiber by sparse light intersection wavelength division multiplexer (CWDM interleaver).What CWDM 20nm/40nm light intersected the wavelength division multiplexer use is the dielectric filter plate, so cost is very low.Traditional light intersects wavelength division multiplexer and uses three-dB coupler, can intersect the scheme of wavelength division multiplexer than using up of proposing of the present invention like this and many loss of 2dB at least, and this can cause satisfying the performance requirement of CFP.Conventional 10G duplex multiplexer is made of TO-CAN (coaxial packaging) receiver and a TO-CAN transmitter.Shown in Fig. 3 a and Fig. 3 b, 2:1MUX among the present invention after the improvement is made of dielectric filter plate 1 and two TO-CAN transmitters (as DML), and wherein filter plate can synthesize an independently transmission path (every optical fiber is a transmission path) to the light signal that contains two wavelength.Compare with traditional technical scheme, cost of the present invention hangs down the income height, and very is fit to large-scale production.
CFP optical transceiver transmitting terminal structure of the present invention is small and exquisite, is placed on CFP/CFP2/CFP4 easily.
As shown in Figure 6, the present invention has light and intersects the CFP optical transceiver of wavelength division multiplexer and also can be used among the 100GCFP/CFP2/CFP4, as 100GBASE-LR4CFP.In the optical transceiver of present embodiment, the physical package of its transmitting terminal the inside comprises the 2:1MUX of a local area network (LAN) light intersection wavelength division multiplexer (being LAN-WDM interleaver) and two improvement.Fig. 7 a is depicted as the 2:1MUX of transmitting terminal in the embodiment of the invention two and the composition structural representation of LAN-WDM interleaver, 2:1MUX is made of dielectric filter plate 1 and two TO-CAN transmitters (as EML), and wherein filter plate can synthesize an independently transmission path (every optical fiber is a transmission path) to the light signal that contains two wavelength.Shown in Fig. 6 and Fig. 7 a, at transmitting terminal, the light signal of ten road 10Gbit/s becomes four the tunnel by a 10:4 parallel-to-serial converter, and respectively (bit-rates values 25G only is a nominal value for 25Gbit/s, actual speed rate can be between 25-32Gbit/s) LAN-WDM wavelength (1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm) light signal, optical signals MD enters 2:1MUX then, 4 road LAN-WDM wavelength X 1, and λ 2, λ 3, λ 4 (λ 1=1295.56 ± 1.03nm, λ 2=1300.05 ± 1.04nm, λ 3=1304.58 ± 1.04nm, the TO-CAN transmitter by two 2:1MUX of λ 4=1309.14 ± 1.05nm) is multiplexed with two branch road light signals, and (λ 1, λ 3 and λ 2, λ 4), two branch road light signals enter in the optical fiber by LAN-WDM interleaver and transmit.Fig. 7 b and Fig. 7 a difference are that the transmitter of 2:1MUX is a DML TO-CAN transmitter among Fig. 7 b.
The receiving terminal as 40GBASE-LR4CFP among the present invention also can adopt the structure that comprises CWDM De-interleaver (sparse light intersection Wave decomposing multiplexer) and 1:2DeMUX (1:2 diplex demultiplexing device), and the receiving terminal of 100GBASE-LR4CFP also can adopt the structure that comprises LAN-WDM De-interleaver (local area network (LAN) light intersection Wave decomposing multiplexer) and 1:2DeMUX (1:2 diplex demultiplexing device).
The present invention also can be used for 40GBASE-ER4CFP, the structure of its transmitting terminal also can adopt the identical structure with 40GBASE-LR4CFP, promptly use CWDM interleaver and the improvement after 2:1MUX, 40GBASE-ER4CFP detector (being receiving terminal) adopts SOA+PIN+TIA (SOA:Semiconductor Optical Amplifier, semiconductor optical amplifier) or APD (Avalanche Photo Diode, avalanche diode) but not PIN+TIA detector among the 40GBASE-LR4CFP.The present invention also can be used for 100GBASE-ER4CFP, the structure of its transmitting terminal also can adopt with 100GBASE-LR4CFP similarly the structure of 2:1MUX after LAN-WDM interleaver and the improvement, PIN+TIA detector but the 100GBASE-ER4CFP detector adopts SOA+PIN+TIA (SOA:Semiconductor Optical Amplifier, semiconductor optical amplifier) or APD among the 100GBASE-LR4CFP.
The present invention has light, and to intersect the CFP optical transceiver of wavelength division multiplexer be that a kind of this optical transceiver is simple in structure at the optical transceiver that is used for 40G or 100G CFP (LR4 and ER4 type) communication system, has low cost, encapsulation and the advantage produced in batches easily easily.In this structure, the CWDM of 4 wavelength (or LAN-WDM) light signal is multiplexed with two groups of light signals by 2:1MUX, and two groups of light signals enter in the optical fiber by light intersection wavelength division multiplexer then.Adopt technology of the present invention, can make the receiving terminal cost be reduced to 1/5th to 1/10th of original technology.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. one kind has light and intersects the CFP optical transceiver of wavelength division multiplexer, it includes transmitting terminal and receiving terminal, it is characterized in that, described transmitting terminal has two groups of 2:1 diplex multiplexers and intersects wavelength division multiplexer with a light that this 2:1 diplex multiplexer is connected by optical fiber, and described 2:1 diplex multiplexer and described light intersect wavelength division multiplexer and is used for that all the two-way wavelength optical signals is coupled into an optical fiber and transmits.
2. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 1, it is characterized in that, described light intersection wavelength division multiplexer is sparse light intersection wavelength division multiplexer, in described transmitting terminal, four road light signals are multiplexed in the emission monomode fiber by clock and data recovery, laser diode, described 2:1 diplex multiplexer and described sparse light intersection wavelength division multiplexer successively and transmit.
3. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 2 is characterized in that the structure that described receiving terminal adopts the p-i-n photodiode to combine with transimpedance amplifier.
4. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 2 is characterized in that the structure that described receiving terminal adopts semiconductor optical amplifier to combine with p-i-n photodiode and transimpedance amplifier.
5. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 2, it is characterized in that, what described sparse light intersected the wavelength division multiplexer use is the dielectric filter plate, described 2:1 diplex multiplexer is made of dielectric filter plate and two coaxial packaging transmitters, and this coaxial packaging transmitter is direct modulated laser.
6. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 1, it is characterized in that, described light intersection wavelength division multiplexer is a local area network (LAN) light intersection wavelength division multiplexer, in described transmitting terminal, ten road light signals become four road light signals by a 10:4 parallel-to-serial converter, the optical signals modulators drives successively enters described 2:1 diplex multiplexer and described local area network (LAN) light intersection wavelength division multiplexer then, and last optical multiplexed signal is used in the emission monomode fiber and transmitted.
7. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 6 is characterized in that the structure that described receiving terminal adopts the p-i-n photodiode to combine with transimpedance amplifier.
8. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 6, it is characterized in that, the structure that described receiving terminal adopts semiconductor optical amplifier to combine with p-i-n photodiode and transimpedance amplifier, perhaps described receiving terminal adopts avalanche diode.
9. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 6, it is characterized in that, described 2:1 diplex multiplexer is made of dielectric filter plate and two coaxial packaging transmitters, and this coaxial packaging transmitter is direct modulated laser or Electroabsorption Modulated Laser.
10. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 1, it is characterized in that, described receiving terminal adopts the structure that comprises light intersection Wave decomposing multiplexer and 1:2 diplex demultiplexing device, and this light intersection Wave decomposing multiplexer is sparse light intersection Wave decomposing multiplexer or local area network (LAN) light intersection Wave decomposing multiplexer.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102496614A (en) * | 2011-11-25 | 2012-06-13 | 深圳市易飞扬通信技术有限公司 | Packaging structure and packaging method of collimated light device |
| CN102710334A (en) * | 2012-05-25 | 2012-10-03 | 武汉电信器件有限公司 | 40G CFP optical module for long-distance transmission |
| CN102750253A (en) * | 2012-06-06 | 2012-10-24 | 武汉电信器件有限公司 | Centum form factor pluggable (CFP) optical module and management data input/output (MDIO) interface communication method thereof |
| CN102833004A (en) * | 2012-08-23 | 2012-12-19 | 武汉电信器件有限公司 | 100G form-factor pluggable (CFP) optical module with transmission distance larger than 40 kilometers |
| CN103411668A (en) * | 2013-07-30 | 2013-11-27 | 武汉电信器件有限公司 | Optical power meter based on LAN-WDM wave band |
| CN106772816A (en) * | 2017-03-01 | 2017-05-31 | 武汉光迅科技股份有限公司 | A kind of structure and implementation method of two-forty planar optical waveguide |
| CN107959530A (en) * | 2016-10-14 | 2018-04-24 | 瞻博网络公司 | Optical transceiver with exterior laser source |
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| US20060291861A1 (en) * | 2005-06-23 | 2006-12-28 | Samsung Electronics Co.; Ltd | WDM PON with interleaver |
| WO2010134986A2 (en) * | 2009-05-20 | 2010-11-25 | Neophotonics Corporation | 40,50 and 100 gb/s optical transceivers/transponders in 300pin and cfp msa modules |
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| US20060291861A1 (en) * | 2005-06-23 | 2006-12-28 | Samsung Electronics Co.; Ltd | WDM PON with interleaver |
| WO2010134986A2 (en) * | 2009-05-20 | 2010-11-25 | Neophotonics Corporation | 40,50 and 100 gb/s optical transceivers/transponders in 300pin and cfp msa modules |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102496614A (en) * | 2011-11-25 | 2012-06-13 | 深圳市易飞扬通信技术有限公司 | Packaging structure and packaging method of collimated light device |
| CN102710334A (en) * | 2012-05-25 | 2012-10-03 | 武汉电信器件有限公司 | 40G CFP optical module for long-distance transmission |
| CN102750253A (en) * | 2012-06-06 | 2012-10-24 | 武汉电信器件有限公司 | Centum form factor pluggable (CFP) optical module and management data input/output (MDIO) interface communication method thereof |
| CN102833004A (en) * | 2012-08-23 | 2012-12-19 | 武汉电信器件有限公司 | 100G form-factor pluggable (CFP) optical module with transmission distance larger than 40 kilometers |
| CN103411668A (en) * | 2013-07-30 | 2013-11-27 | 武汉电信器件有限公司 | Optical power meter based on LAN-WDM wave band |
| CN107959530A (en) * | 2016-10-14 | 2018-04-24 | 瞻博网络公司 | Optical transceiver with exterior laser source |
| CN107959530B (en) * | 2016-10-14 | 2020-10-16 | 瞻博网络公司 | Optical transceiver with external laser source |
| CN106772816A (en) * | 2017-03-01 | 2017-05-31 | 武汉光迅科技股份有限公司 | A kind of structure and implementation method of two-forty planar optical waveguide |
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